[Bug ld/29377] non-canonical reference to canonical protected function

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=29377

Fangrui Song <i at maskray dot me> changed:

           What    |Removed                     |Added
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                 CC|                            |i at maskray dot me

--- Comment #3 from Fangrui Song <i at maskray dot me> ---
This patch looks good to me.

__attribute__((visibility("protected"))) void *foo() {
  return (void *)foo;
}

% gcc -m32 -fpic -shared -fuse-ld=bfd b.c
/usr/bin/ld.bfd: /tmp/cc3Ay0Gh.o: relocation R_X86_64_PC32 against protected
symbol `foo' can not be used when making a shared object
/usr/bin/ld.bfd: final link failed: bad value
collect2: error: ld returned 1 exit status

I'd still with that the x86 port considers
https://sourceware.org/pipermail/binutils/2022-June/121423.html

I have fixed GNU ld's aarch64/arm ports to match other ports and lld. This
addresses all issues reported on
https://maskray.me/blog/2021-01-09-copy-relocations-canonical-plt-entries-and-protected

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